Amphibian vehicle



FIG. 1 is a front, top, and right side perspective view of an amphibian vehicle showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a right side elevational view thereof.

Features shown in broken lines show environmental structure and form no part of the claimed design. The oblique lines on the lower half of the vehicle are surface texture. 

We claim the ornamental design for an amphibian vehicle, as shown. 